Of the fifty-five extant letters of Hadrian no less than forty-five are addressed to Charlemagne, and they are overwhelmingly concerned with his temporal possessions. He is rather a King-Pope than a Pope-King. For twenty years he assails Charlemagne with querulous, petulant, or violent petitions to protect the rights of the Blessed Peter, and it is not illiberally suspected that the lost replies of Charlemagne contained expressions of impatience. The Pope's letters, with their unceasing references to the Blessed Peter and all that he has done for Charlemagne, are not pleasant reading, and the Frank King, whose Italian policy seems to baffle his biographers, must have realized that his position as suzerain of the Blessed Peter was delicate and difficult. Hadrian on the other hand, found that the temporal rights of his See left comparatively little time for spiritual duties and laid a strain on his piety. Once in a few years he smites a heretic or arraigns some delinquent prelate, but the almost unvarying theme of his letters is a complaint that the Blessed Peter is defrauded of his rights, and he is at times drawn into political intrigues which do not adorn his character. We may recognize that his ambition was as impersonal as that of Gregory the Great, yet the spectacle of his plaints and manoeuvres is not one on which we can dwell with admiration. Charlemagne had scarcely returned to France when he received from Hadrian a bitter complaint that Leo, Archbishop of Ravenna, had seized the cities of the exarchate and was endeavouring to win those of the Pentapolis.[125] Charlemagne did not respond; indeed Leo went in person to the Frank court, and it is significant that after his return he was, Hadrian says, more insolent and ambitious than ever. He cast out the officials sent from Rome and, by the aid of his troops, took over the rule of the exarchate. Charlemagne was busy with his Saxon war, and he paid no attention to the Pope's piteous appeals.[126] Leo died in 777, however, and his successor seems to have submitted to Rome. Charlemagne had meantime visited Italy and may have intervened.